Microstructure and mechanical properties of overlaying specimens in GMAW hybrid an additional longitudinal electromagnetic field

In order to meet requirements of hot forge mould in the plastic manufacturing fields, the gas metal arc welding (GMAW) with a longitudinal electromagnetic field (LMF-GMAW) is applied to manufacture the bimetal thermal forming mould and repair the old die. The microstructure and mechanical properties are analyzed by SEM, EDS, micro-hardness, wear-resistance and thermal physical simulation testing methods. Our study shows that the LMF-GMAW method can increase the wear resistance property of the surfacing layer, enhance the interface bonding ability and improve the thermal mechanical strength of bimetal overlay work pieces.